I just pulled my old bicycle out of the garage. It's about 10 years old (a 21-speed mountain bike). It was working when it was put into storage.
When I tried to ride it today, the crank wouldn't engage properly to make the chain rings rotate; or more casually, when I pedaled nothing moved but the pedals themselves.
I flipped the bike over and if the rear wheel was spinning at a fair speed then the chain rings would engage when the crank was turned and the rear wheel had power driven to it as normally expected.
Is there a freewheel or freehub at the crank / chain ring junction that I should examine?
I read through a few dozen questions but I couldn't find any that addressed this specific issue; I hope this is a new question and not just a serious misunderstanding on my part!
I'll post a video shortly, but to give further clarification...
- The chain is on the gears; the chain does not slip
- I can backpedal and the chains and gears spin, as normally expected
- However, if I pedal forward, the gears which are located at the pedals will not spin; the pedals rotate freely. They rotate as if the thing they are supposed to be affixed to isn't attached.
Also, I'm certainly misusing terms here! By "chain rings" and "crank" I was referring to the areas of the bike as indicated in this diagram: